I recently gave a talk at a large venue to nearly 1,000 people. It seemed to go well but who am I to judge? The experience of giving a speech is radically different from the experience of listening to one. An adrenaline-drenched emotional rollercoaster for a nervous speaker may nevertheless be unbearably tedious for the listeners. A superbly honed performance may produce a sense of suspense, surprise and delight for the audience; the result of many hours of rehearsal and repetition for the speaker. Yet it can be very hard indeed for the speaker to know what worked and what didn't.

Audience comments aren't much help, either. People are polite, and they know that giving a speech is difficult, so a handshake and a “well done” could mean anything from “you moved me to tears” to “you bored me to tears”. A speaker can float through talk after talk in a warm bath of gently encouraging remarks.

On this particular day, though, I was in for less of a warm bath, more of a bracing shower. The Geoffrey Boycott of personal financial advisers was in the audience - a tall Yorkshireman with lots of unvarnished opinions that he felt duty-bound to share with me in the lobby afterwards.